Thanks a lot for your help Dr Seow !

E. marguerita is endemic of Sumatra (Zool. Meded. 10 (8): 129, (9: pl. 4, f. 1a-b)) : https://www.repository.naturalis.nl/document/149267

Here is the approximate translation in English of the description :

After related to I. oblitterans Feld. (male) Vein system similarly depicted on the adjacent text figure; the median makes a turn in the cell, so that it was initially very narrow, and suddenly broadened at the end. There is a fold in the cell with string scales and a brown spot beneath it
from ditto scales to vein 3. Between veins 1 and 2 is another fold with modified scales, as with I. oblitterans Feld.

The front wing veins 7, 8 and 9 are stalked in such a way that 8 and 9 come together at the same point, so that a trident is formed, or 8 and 9 very shortly after one another. The location of these three veins relative to SS a varies! For the female, 8 and 9 are always short on 7 (see text figure).

Head, tegulae, patagia, thorax and abdomen end yellow; the first part of the abdomen gray; legs yellow to brown-yellow; the coxae and the bases of the femora turn yellow. Front wings very light brownish yellowish-white with a purple hue; the costa yellow or yellow-white. Rear wings white with a yellow tint, particularly marginal and apical. No trace of a wing drawing.